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A013951 Start with 1, apply 1->12, 21->21, 22->21, 2->2 (for final 2); take limit; note positions of 1's. 0
1, 4, 5, 7, 10, 12, 13, 16, 17, 20, 21, 23, 26, 27, 29, 32, 34, 35, 37, 40, 42, 43, 46, 47, 50, 52, 53, 56, 57, 60, 61, 63, 66, 67, 70, 71, 74, 75, 77, 80, 81, 83, 86, 88, 89, 91, 94, 95, 97, 100, 101, 103, 106, 108, 109, 111, 114, 116, 117, 120 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..60.

CROSSREFS

Cf. A013949.

Sequence in context: A047259 A287658 A039577 * A269861 A187479 A013947

Adjacent sequences:  A013948 A013949 A013950 * A013952 A013953 A013954

KEYWORD

nonn

AUTHOR

Clark Kimberling

EXTENSIONS

Missing 88 inserted by Sean A. Irvine, Sep 02 2018

STATUS

approved

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Last modified March 2 06:37 EST 2021. Contains 341744 sequences. (Running on oeis4.)